Image of the Day: A Green Ghost Shrouding a Supermassive Black Hole


The Hubble Space Telescope has photographed the eerie, green-glowing gas highlighted by a recently deceased quasar the size of the Milky Way located about 730 million light-years away, surrounding a supermassive black hole that was once the heart of a galaxy. The glowing gas cloud, known as Hanny’s Voorwerp, is now 100 to 10,000 times dimmer than the quasar was when it was still sucking in the surrounding matter. The nearby spiral galaxy IC 2497 is triggering star formation in the yellow-orange fringes of the Voorwerp.


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